One of Software Engineering’s main goals is to build complex applications in a simple way. For that, software components must be described by its functional and non-functional properties. Then, the problem is to know which component satisfies a specific need in a specific composition context, during software conception or maintenance. We state that this is a substitution problem in any of the two cases. From this statement, we propose a need-aware substitution model that takes into account functional and non-functional properties.
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